Here's the citation from the "Green book" (2004 USPSA rules):
20. Aftermarket parts, components and accessories are prohibited, except as follows:
20.1 Aftermarket magazines which match the external dimensions of
standard magazines offered by the OFM for the approved handgun
20.2 Aftermarket sights of the same type and kind offered by the OFM
for the approved handgun are permitted, provided their installation
and/or adjustment requires no alteration to the handgun.
20.3 Aftermarket grips which match the profile of the OFM standard for
the approved handgun and/or the application of grip tape is permitted,
however, rubber sleeves are prohibited.
Unless the Para is offered with finger groove panels from the factory, those would not be allowed, as they do not match the profile of the OFM (even though they are not a sleeve).
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